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The French New Master Sample 2009 : building fresh annual sampling frames for household surveys based on the new annual Census. Marc CHRISTINE, Sébastien FAIVRE Insee, Statistical Methods Unit. This presentation is based on a collective work with contributions of :
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Marc CHRISTINE, Sébastien FAIVRE
Insee, Statistical Methods Unit
Vincent LOONIS, Edouard MAUGENDRE, Bruno BERLEMONT, Emmanuel GROS, Fabien GUGGEMOS (Insee).
Pour une Utilisation
Coordinated Household Sampling System.
=> A Master Sample system is still useful
=> This ensures a geographical concentration of the surveyed dwellings in order to reduce survey costs.
To take profit from the « freshness » brought by the new Census :
=> Advantages :
Issue : how to conciliate the principle of drawing « rotating » samples from the most recent Census and building fixed Primary Units (IAA = Interviewers Action Area).
III. 1 Constraints and objectives.
A) Big municipalities.
B) Small municipalities.
=> For that purpose, considering the great number of constraints and the complexity of the problem, a specific algorithm has been implemented.
In each region, it begins with the largest municipality (number of main dwellings) among the small ones : it is tried to build a PU around this municipality.
Building of the PU around the largest municipality not yet allocated (that will be the « center » or « pivot » of the PU).
A PU is achieved if, among municipalities of the same region (not yet allocated), whose distance to the pivot is less than a given threshold, it is possible to find enough municipalities in order to reach 300 main dwellings in each rotation group. If not, the PU is not constituted.
At each step, the biggest municipality not yet allocated to one PU is tested as a possible pivot.
At the end, all remaining communities are allocated to the closest PU.
Municipalities surveyed in 2010
Municipalities surveyed in 2011
Municipalities surveyed in 2012
Municipalities surveyed in 2013
Le ménil Bérard
Ferrières La Verrerie
Moulins La Marche
Ste Gauburge PU
Municipalities surveyed 2009-2013
=> ZAE are « random objects ».
(convention : only trajects between two different municipalities are taken into account, trajects within the same municipality being set to 0).
- Center (pivot) of the IAA for New Master Sample 2009 (NMS 2009)
- Biggest municipality of the PU for the Master Sample 1999 (MS 1999).
=> Average traject of an interviewer is calculated as the average distance of a PU’s dwelling to the center municipality (weighted by the part of PU’s dwellings located in the municipality).
(11,4 millions of dwellings)
(12,3 millions of dwellings).
V. 1 Computation of allocation.
Basic hypotheses :
Chosen parameters :
Within each drawn IAA, secondary units (dwellings) are drawn with simple random sample, in the given yearly rotation group.
=> It is difficult to compute the actual likelihood.
=> Necessity of resampling dwellings in the sampling frame to have a frame of dwellings with equal weights.
(variables not taken into account as balancing conditions at the time of drawing IAA).
=> It may creates problems, particularly for yearly surveys, measuring evolutions.
Theoretical background for calibration.
=> several sets of calibrated weights.
Example : impact of calibration on the variable « number of registered people at the National Employment Agency (ANPE) » at the end of the month.